S10 Sport 4.3 V6 refurbishing
#11
The tachometer is alive now กกก
it is never endding history....after replaced chip was not working yet, so osciloscope on hand and checked signal from car, made a simulator signal circuit based on NE555 and studied the tacho circuit board. there was a resistor missing on circuit regarding LM1819 Datasheet, I installed adjustable resistor and made calibration helped by osciloscope and NE555. now is working fine.
the tacho board with 1M adjustable resistor on it
the tacho board with 1M adjustable resistor on it
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